Looper-operating mechanism for sewing-machines.



PATENTED DEC. 31. 1907. L. ONDBRDONK. LOOPBR OPERATING MECHANISM FOR SEWING MACHINES; APPLICATION FILED JUNE 3, 1904. Q

3 SHEETS-SHEET 1.

MU w WW f I .gllllllllllllll No.'875,59'3. PATENTED DEC. 31, 1907..

ONDERDONK. LOOPER OPERATIZJG MECHANISM FOR SEWING MACHINES.

f 'PLIGIICION FILED JUNE 3. 1904.

s SHEETS-SHEET 2.

Swuen fez PATENTED DEC. 31, 1907.

L. ONDERDONK. I 'LOOPER OPERATING MECHANISM FOR SEWING MACHINES.

u l i \L d u. n WM s H, v 1 LE W, i W @w 0 2 m UNITED STATES PATENT OFFICE.

LANSING ONDERDONK, on NEW YORK, Y., ASSIGNOR TO UNION SPECIAL sEwINeimcHiNE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS,

LooPER-OPERATING MECHANISM FOR SEWING-MACHINES.-

Patented Dec. 3 1, 1907.

Application filed Tune 3, 1904. Serial No. 211,058. i- J 1 To all whom it may concern:

Beit known that I, LANSING ONDERDONK, a citizen of the United States, residing at. New York, in the county of New York-State of New York, have invented certain new and useful Improvements in Looper-Operating Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the letters and. figures of reference marked thereon.

My invention relates tcan improvement in sewing machines, and particularly to a looper operating mechanism for chain stitch sewing machines, employing an upper rotary shaft. The object. of the invention is to provide a looper operating 'mechanism for'a chain stitch sewing machine which shall be capable of running at extremely high speed, which shall be simple and effective, not likely to get out of order, and which shall impart to the looperthe necessary variable movements to give the proper dwell to the looper, after it has taken the needle loop and is swinging over in its needle-avoiding movement.

The invention, therefore, consists in the matters hereinafter described. and referred to in the appended claims.

The invention is illustrated in the accom pany'ing drawings, in which, 1

Figure 1 is a sectional side view of a sewing machine, embodying the invention, parts of the operating mechanism of' the machine,.

other than. the looper movement, being removed; Fig; 2 is a bottom plan view; Fig. 3 is a view on line 73.3, Fig. 1; Fig. 4 is a detail view of the vertical lever; and Fig. 5 a detail view of the looper support.

In these drawings, A represents the frame of a sewing machine of a suitable type, in the goose neck or upper partof whichisjournaled the rotary driving shaft B.

C represents the looper-supporting shaft, which is journaled: in bearings on the under side of the bed of the machine, and said shaft has at its forward end an arm extending at an angle to the shaft on which is mounted the looper rocker D, upon which thelOOper'E is secured.

The shaftC is rocked in its bearings, to give the side-wise or needle-avoiding movement to the looper, by means of the crank F, secured to the shaft C, and having a pitman connection G with the eccentric H on the shaft.

' The main feature of my invention consists in the mechanism for imparting to the looper its forward and backward movementin the direction of its length, with. the proper timing of such movement to give a dwell, while the needleavoiding movement is taking place.

Upon the main shaft is a ball crank I, em.- braced by the upper end of a pitman con-- necting rod K, which at its lower end embraces a ball L on the end of the stud M, received into the lug N projecting. upwardly from the link or bracket (),"whi.ch is pivoted on the short shaft P, mounted in the rear of thebase of the machine. v The bracket or link O, is pivoted on a stud Q, to which isalso pivoted the forked end of the link R, which at its oppositeond is forked and pivoted to the vertical lever S, by means: of the stud a. This vertical lever S, at its upper end is secured to a short rocking shaft T, while-at the lower end it has a halland stud connection U with the pitman rod W,

by which motion is inparted to the looper rocker, to give the forward and. backward movement to the looper. r

It will be seen that'the links O and R form a toggle and as they alternately straighten and flex, they impart to the vertical lever. S a swinging movement, and, therefore, a for-*- ward and backward movement to the looper; and as when the links arestraight no movement is imparted to the looper, the parts are so timed that the straightening of the links takes place when the looper is at the extreme of its forward movement, thus causing the dwell in the r. -iprocation of'the looper in the direction of its-length, while it is accomplishing the needle-avoiding movement. I am aware that'itis not new to provide for; reciprocating a looper by alternately straightening and flexing toggles. hen the toggles act directly upon the looper rod, or shaft, the construction is not'practicable because it causes astrain and bind upon the bearings of the shaft, thus causing wear, and interfering with high speed. Byproviding the pivotedwertical lever S, an in tcr mediate connection between the toggles and the looper rod is provided, which avoids any vertical strain, and enables the looper rod to be driven back and forth in a straight line, without vertical movement.

The throw of the looper may be adjusted by-adjustirig the length of th pitman K.

This is accomplished by providing the cen-' m1 rod of the pitman with right and left hand screw threads, which engage corresponding threads in the connecting parts. By turning the rod one way or the other, the pitman is lengthened or shortened. This change in the length of the pitman causes a change in position of angular movement of the toggle links, and thus the. throw of the looper is changed. 1

Having thus described my invention, what 3 I claimas new, and desire to secure by Letand an intermediate connection between the links and the looperoperatin rod and means independent of the looper roc for supporting said connection; substantially as described.

2. In a sewing machine, a driving shaft, a looper supporting shaft, a looper carried thereby and means for operating the shaft, to give the looper a needle-avoiding movement, a looper-operating rod to'give the looper a forward. and backward movement in the 1 direction of its length, and means for operatingv said looper-o erating rod, com-' prising a series of pivote links, with connections to'th'e driving shaft for operating them, and an intermediate connection between the links and the looper-operating rod. and means for adjusting the vibrating position of said links; substantially as described.

3. In a sewing machine, a driving shaft, a looper-supporting shaft, a looper carried thereby and means for operating the shaft,

to; give the looper a needle-avoiding movement, a looper-operating rod to give the looper a forward and backward movemen in the direction of its length, and means for operating said looper-operating rod, comprising a link or bracket pivoted at one end to the machine frame, a second link pivoted the'i'eto at one end, and a vertical swinging lever, to which the other end .of the second linkiis ivoted, and connections between said vertica lever and the looper-operating rod substantially as described. I

4. In a sewing machine, a main shaft, a looper support and a looper carried thereby,

means for imparting a needle-avoiding movement to the loo )er, and means for imparting a forward and ackward movement to the looper, said latter means comprising toggle links, an adjustable connection between the thereby and means for 0 crating the shaft,

to give the looper aineec le-avoiding movement, a looper-operating rod to give the looper a forward and backward movement in the direction of its length, and means for operating said looper-operating rod, com-. prising a series of pivoted links, with connections to the driving shaft for operating them, i

and an intermediate connection between the links and the looper-operating rod, and means independent of the looper rod for supporting said intermediate connection; substantially as described.- v

'6. In a sewing machine, a driving shaft and a looper, means for vibrating said looper laterally and means for impartin a forward and backward movement to said Iooper comprising a series of pivoted linkswith connections to the driving shaft for operating them, and a vertical swinging lever pivoted to the machine frame with connections between the vertical lever and the looper and a connection between said lever ,and one of the pivoted links; substantially as described.

7. In a sewing machine, a looper and a driving shaft, means operatively' connected to the driving shaft for giving the looper sidewise movements, and 'means for giving the looper forward and backward movements, comprising toggle links, a swingirfg lever, one end of said toggle links being connected to the swinging lever intermediate its end, and the other end of said toggle links being connected to the machine frame, a link operatively connecting the toggle links with the driving shaft, and a rod having one end connected to the looper and the other end conpected to and supported by the swinging ever. I

In testimony whereof, I afliX my signature in presence of two witnesses.

LANSING ONDERDONK. Witnesses:

W. L. SWIFT, E. T. ALLAN. 

